package kr.hkit.powerjava.chapter16.ex;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;

class MyPanel extends JPanel implements ActionListener{
	boolean flag = false;
	private int light_number = 0;
	
	public MyPanel() {
		setLayout(new BorderLayout());
		JButton b = new JButton("traffic light turn on");
		b.addActionListener(this);
		add(b, BorderLayout.SOUTH);
	}
	
	@Override
	public void actionPerformed(ActionEvent e) {
		if(++light_number >= 3){
			light_number = 0;
		}
		repaint();
	}

	@Override
	protected void paintComponent(Graphics g) {
		super.paintComponent(g);
		g.setColor(Color.BLACK);
		g.drawOval(100, 100, 100, 100);
		g.drawOval(100, 200, 100, 100);
		g.drawOval(100, 300, 100, 100);
		if (light_number == 0){
			g.setColor(Color.RED);
			g.fillOval(100, 100, 100, 100);
		} else if (light_number == 1){
			g.setColor(Color.GREEN);
			g.fillOval(100, 200, 100, 100);
		} else{
			g.setColor(Color.YELLOW);
			g.fillOval(100, 300, 100, 100);
		}
	}
	
	
}

public class MyFrame extends JFrame {

	private JPanel contentPane;

	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				try {
					MyFrame frame = new MyFrame();
					frame.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}

	/**
	 * Create the frame.
	 */
	public MyFrame() {
		add(new MyPanel());
		setSize(300, 500);
		setVisible(true);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//		setBounds(100, 100, 450, 300);
//		contentPane = new JPanel();
//		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
//		contentPane.setLayout(new BorderLayout(0, 0));
//		setContentPane(contentPane);
	}

}

